2025 Volume 81 Issue 16 Article ID: 24-16047
In this study, we developed a new inexpensive smart drainage gate to replace existing smart paddy field dam equipment. An analytical model of the Makigawa basin in Kahoku-cho, Yamagata Prefecture, was constructed to evaluate the flood mitigation effects by the new smart paddy field dam equipment, and inundation simulations were conducted with the conventional and the new smart paddy field dam under multiple rainfall scenarios. The results showed that the flooded area and flooded volume reduction rate by the new smart paddy field dam were greater than those of a conventional paddy field dam under all rainfall scenarios. It was shown that, in watershed where sluiceway is fully closed to prevent the inflow of river water during heavy rain, the smart paddy field dam, which completely store rainwater up to the standard drainage water level, may have a higher flood mitigation effect than the conventional paddy field dam that store rainwater while allowing run-off.
